Heater



Patented Feb. 27, 19.23.

JESSE A. MARTIN, 0F LOS ANGELES, CALIFORNIA.

Application fil ed'J'une 13, 1922. Serial 1V0. 567,912..

.My invention relates to heaters,,and is particularly a} heater adaptedto use in heated 'air heating and'ventilat-ion systems.

It is an obj ectofthe invention to provide a new and improved form ofheat-er which will accomplish a very. efiicient interchange of heatbetween the combustion products and the recipient air.

Itis a further object of the invention to provide a heaterof thischaracter which is simple of construction and whichmay-be:

economically manufactured. v g

The especial advantages ofv the nvention andsfurther objects thereofwill be made evident hereinafter.

Referring to the drawing, which is for illustrative purposes only p iFlg. 1 1s a longitudmal sectional view through a heaterembodyingmyinvention. Fig. 2 is a section taken-on the vertical planerepresentedby the li i 1e.22 of Fig. 1. --Fig. 3- is a section taken onthe horizontal plane represented by the line 33 of Fig. 2.-

As shown in the drawing, a combustion chamber 11, constructed of sheetmetal, is provided. This combustion chamber has sheet' metal tubes 12extending upwardly therefrom, the upper ends of these tubes beingconnected into a header l8. Centrally within the tubes 12 and throughthe combustion chamber 11 and the header '13, sheet metal tubularmembers 15 are extended, these members having open ends through whichthe air to be heated may travel. Although the lower ends 16 of the tubes15 are shown extending through the bottom 18 of the housing 19 so thatthe recipient air may be drawn directly from the exterior into the tubes15, these tubes may extend only to the bottom wall 21 ofthe combustionchamber 11, as holes 22 are provided in the bottom 18 of the housing19through which cold air is also drawn into the heater.

From the top of the header 13 a flue 25 for the discharge of combustiongases is provided, this flue extending downwardly into the header 13 asindicated at 26 and having holes 27 formed therein, so that the flow ofcombustion gases through the flue 25 somewhat increasedtherebyt A' fpan28 is placed upon the top of the combustion chamber between the rows.of'tubes12 'in which water may be placed for-humidifyingthe air as'it isheated. I

The burner which I emp consists of a pipe .30 whichGXt-BIidSlQflgitudinally within the combustion chamber 11 and has tworows of holes 31 placed in the under side thereof, these'holesfbcing'laterally directed so that the flames areflspread out along thebottom21of the combustion chamber and rise up along .thesides of'the combustionchamber, thus providing a very complete distribution of heat to thewalls of the chamber through which the heat is lo-y thisheater.

transferred to the recipient air "within the.

chamber enclosed by the'housing19. v

The combustion gases rise throughlthe tubular passages formed betweeninner and outer tubular members 15 and 12, heating these tubular membersduring this passage, and from thence proceeding into'the header 13 andtherein transferring thegreaterportion of the heat no'w remaining in thecombustion gases't o the walls 2350f the" header From the header 13 thecombustion gases, from which the heat has been almost 'entirelyriemoved, "are carried through the flue 25 to the chimney or stackprovided for conducting the same to the exterior of the building. theside walls 38 of the housing 19 to points 89 between the tubular member12, inden tations 40 being cut therein so that the edge of the platewill adhere to the. contour of the members 12, thus providing means fordirecting the air in a circuitous path between the tubes 12, asindicated by the arrows 41, the heated air passing around the header 13and outwardly through the discharge opening42 provided in the top of thehousing 19. Air is also drawn through the tubular members 15, this airbeing heated by. radiation and by contact with the tubes as it passesupwardly therein, and joining the outflowing stream of heated air with.which it is carried through the opening 42 to the point of application.

A particular resides in the simple mannerin which a very large heatradiating surface is provided by the use of inner-and outer tubularmembers such as I employ, it being possible with the construction I havedevised to form heater units of any desired capacity.

Deflector plates 37 extend from I feature of the invention enter theflue to establish the necessary draft for the supportof propercombustion.

In my experiments with this part of the heater, Ihave found theemployment of the holes 27 to increase the efliciency of the furnacefifteen percent over the construction not employing such holes.

I /claim 5 3 intenti I 1. ii heater compris ng: walls forming acombustion chamber; tubes extending up wardly frQII Said combustionchamber and having their interiors in open communicati n ith th n e o ad c amb he d n o which th upp r e ds of a o Sa d tubes are n ected he ntr o o each of said tubes being in open communication with the interiorof said header; a flue co mected into said header; a burner in saidcombustion chamber; tubular members each extending centrally through oneof said tubes and being connected into the upper wall of saidheader,each of said tubular members being also connected into the lower wall ofsaid combustion chamber and extending downwardly therefrom below saidcombustion chamber; and a housing surrounding the structure previouslydescribed, said tubular members be ing secured in the bottom of saidhousing and forming the sole support of said structure which does nottouch said housing at any other point except where said flue passesthrough said housing, the lower portion of said housing being perforatedto admit external air thereto.

2. A heater comprising: walls forming a combustion chamber; tubesextending upthrough one of said tubes and being connected into the upperwall of said header,

each of a d when me e 'be nga s QQII- nected into the lower wall of saidcombustion chamber and extending downwardly there om b low sa d mbu n cmb an a hou ng su r unding he st t e previously described,said'tu'bu'lar members he ing secured in the bottom of said housing andforming the sole support of said struc ture which does not touch saidhousing at any other oint except wheresaidflue passes through saidhousing, the lower portion of 7 0 said housing being perforated to admitext nal a t r to In testimony whereof, I have hereunto set my hand atLos Angeles, California, this h day Of un 1922 ESSE A. MARTIN.

